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69 lines
940 B
69 lines
940 B
4 months ago
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// run
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 21687: cmd/compile evaluates x twice in "x op= y", which was
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// detectable if evaluating y affects x.
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package main
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func ptrs() (int, int) {
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one := 1
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two := 2
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x := &one
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*x += func() int {
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x = &two
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return 0
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}()
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return one, two
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}
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func slices() (int, int) {
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one := []int{1}
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two := []int{2}
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x := one
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x[0] += func() int {
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x = two
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return 0
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}()
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return one[0], two[0]
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}
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func maps() (int, int) {
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one := map[int]int{0: 1}
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two := map[int]int{0: 2}
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x := one
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x[0] += func() int {
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x = two
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return 0
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}()
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return one[0], two[0]
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}
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var tests = [...]func() (int, int){
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ptrs,
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slices,
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maps,
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}
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func main() {
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bad := 0
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for i, f := range tests {
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if a, b := f(); a+b != 3 {
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println(i, a, b)
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bad++
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}
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}
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if bad != 0 {
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panic(bad)
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}
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}
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